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Finding the Fourth Proportional to 667.02, 920.45 and 387.24

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Solution

The fourth proportional to 667.02, 920.45 and 387.24 is: 534.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.02 : 920.45 = 387.24 : x
  2. Step 2: Convert to fraction form
    667.02/920.45 = 387.24/x
  3. Step 3: Cross multiply
    667.02x = 920.45 × 387.24
  4. Step 4: Simplify right side
    667.02x = 356,436.39
  5. Step 5: Solve for x
    x = 356,436.39/667.02
  6. Step 6: Final answer
    x = 534.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.